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.\"     @(#)atol.3	8.1 (Berkeley) 6/4/93
.\" $FreeBSD: src/lib/libc/stdlib/atol.3,v 1.16 2009/03/01 05:44:28 delphij Exp $
.\"
.Dd February 1, 2009
.Dt ATOL 3
.Os
.Sh NAME
.Nm atol , atoll ,
.Nm atol_l , atoll_l
.Nd convert
.Tn ASCII
string to
.Vt long
or
.Vt "long long"
integer
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In stdlib.h
.Ft long
.Fn atol "const char *str"
.Ft "long long"
.Fn atoll "const char *str"
.In xlocale.h
.Ft long
.Fn atol_l "const char *str" "locale_t loc"
.Ft "long long"
.Fn atoll_l "const char *str" "locale_t loc"
.Sh DESCRIPTION
The
.Fn atol
function converts the initial portion of the string pointed to by
.Fa str
to
.Vt long
integer
representation.
.Pp
It is equivalent to:
.Pp
.Dl "strtol(str, (char **)NULL, 10);"
.Pp
The
.Fn atoll
function converts the initial portion of the string pointed to by
.Fa str
to
.Vt "long long"
integer
representation.
.Pp
It is equivalent to:
.Pp
.Dl "strtoll(str, (char **)NULL, 10);"
.Pp
While the
.Fn atol
and
.Fn atoll
functions use the current locale, the
.Fn atol_l
and
.Fn atoll_l
functions may be passed locales directly. See
.Xr xlocale 3
for more information.
.Sh IMPLEMENTATION NOTES
The
.Fn atol ,
.Fn atoll ,
.Fn atol_l ,
and
.Fn atoll_l
functions are thread-safe and async-cancel-safe.
.Pp
The
.Fx
implementations of the
.Fn atol
and
.Fn atoll
functions are thin wrappers around
.Fn strtol
and
.Fn stroll
respectively, so these functions will affect the value of
.Va errno
in the same way that the
.Fn strtol
and
.Fn stroll
functions are able to.
This behavior of
.Fn atol
and
.Fn atoll
is not required by
.St -isoC
or
.St -isoC-99 ,
but it is allowed by all of
.St -isoC , St -isoC-99
and
.St -p1003.1-2001 .
.Sh ERRORS
The functions
.Fn atol
and
.Fn atoll
may affect the value of
.Va errno
on an error.
.Sh SEE ALSO
.Xr atof 3 ,
.Xr atoi 3 ,
.Xr strtod 3 ,
.Xr strtol 3 ,
.Xr strtoul 3 ,
.Xr xlocale 3
.Sh STANDARDS
The
.Fn atol
function
conforms to
.St -isoC .
The
.Fn atoll
function
conforms to
.St -isoC-99 .
